A multiproxy study between the Río de la Plata and the adjacent South-western Atlantic inner shelf to assess the sediment footprint of river vs. marineinfluence

Burone, Letícia; Ortega, Leonardo; Franco-Fraguas, Paula; Mahiques, Michel Michaelovitch de; García-Rodríguez, Felipe; Venturini, Natalia; Marín, Yamandú; Brugnoli, Ernesto; Nagai, Renata Hanae; Muñiz, Pablo; Bı́cego, Márcia Caruso; Figueira, Rubens César Lopes; Salaroli, Alexandre Barbosa

doi:10.1016/j.csr.2013.01.003

Cited by 43 publications

(47 citation statements)

References 64 publications

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“…Haug et al, 2001). Elemental ratios serve to normalize data, minimizing matrix effects (Burone et al, 2013, Zabel et al, 2001, Bender the Ti/Ca record shows similar trends as Ti, Fe and K. Because of possible uncertainties in attributing Ti/Ca ratios to precipitation, and given the similar timing amongst the variations of Ti, Fe, K and the Ti/Ca ratio, single-element records are discussed hereafter.…”

Section: Xrf Data and Precipitationmentioning

confidence: 99%

Middle–late Holocene Caribbean aridity inferred from foraminifera and elemental data in sediment cores from two Cuban lagoons

Gregory

Peros

Reinhardt

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Xrf Data and Precipitationmentioning

confidence: 99%

Middle–late Holocene Caribbean aridity inferred from foraminifera and elemental data in sediment cores from two Cuban lagoons

Gregory

Peros

Reinhardt

et al. 2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Near the former, and generated by the opposing river discharge, incoming tide, and wave and tidal current resuspension processes, a maximum turbidity zone (MTZ) can be found. This MTZ is characterized by a high suspended matter concentration and a large portion of the transported solids can flocculate here (Framiñan & Brown, 1996;Framiñan et al, 2008;Burone et al, 2013). These estuarine processes may cause an increase of floating and sank debris in this area.…”

Section: B) Waterwaysmentioning

confidence: 99%

“…On average, the Rio de la Plata discharges about 23,000 m 3 /s of freshwater and supply of 80x10 6 t/year of sediment into the western South Atlantic (Giberto et al, 2004;Piola et al, 2008). The Río de la Plata estuary is a two-layer system with a semi-permanent salt wedge and freshwater flows seawards over the surface (Burone et al, 2013). This salt wedge intrusion creates a well-stratified section characterized by two salinity fronts: the bottom salinity front in the innermost part of the bottom salt wedge, and the surface salinity front in the transition between the turbid river and the less turbid marine waters.…”

Section: B) Waterwaysmentioning

confidence: 99%

Management and research on plastic debris in Uruguayan Aquatic Systems: update and perspectives

Lozoya

Carranza

Lenzi³

et al. 2015

RGCI

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Synthetic plastics have become an indispensable component of modern life, and the amount of plastics disposal has increased dramatically as a result. With human population increasing, it is expected that the prevalence of plastic debris in the environment will also increase, unless sustainable daily habits are incorporated, waste management improved, and new alternative materials are discovered and popularized. To date, several reports show negative effects of plastic debris on marine and freshwater fauna (e.g. invertebrates, birds, turtles, marine mammals). Plastic are ubiquitous in the water column, deposited Lozoya et al. (2015) 378 in fine sediments and enter the guts, respiratory structures and tissues of different aquatic species, and are incorporated into food webs via ingestion. This global problem also affects beach and near-shore activities (e.g. tourism, fisheries, and aquaculture) with negative social and economic consequences. The research of plastics effect on aquatic environments in Uruguay is only incipient. With the aim of contributing to scientific knowledge, decision-making and the management of plastic debris, here we reviewed the available information on plastic debris sources, their impacts on biodiversity, and policy issues in Uruguayan aquatic systems. Moreover, we reviewed and systematized community outreach initiatives, and examined national policies and management initiatives. We found that Uruguayan aquatic systems (freshwater, coastal marine and benthic) are affected by plastic pollution, both from land-based and sea-based activities, although national-level policies are modern and well suited for minimizing the impacts of plastic pollution. We reviewed biota-plastic debris interactions, and found evidence for impacts on a number of aquatic taxa, including the poorly reported ingestion of microplastics in freshwaters fishes and the association with plastic benthic debris. Global and regional hydrographic settings (Río de la Plata Estuary), as well as idiosyncratic ecological, socio-economic and cultural issues, make Uruguay a valuable test-site for this topic. Our ultimate goal is to minimize the effects of this widespread environmental, economic, health and aesthetic problem. Resumo Pesquisas e manejo de descartes plásticos em sistemas aquáticos uruguaios: atualização e perspectivasProdutos plásticos tem se tornado um componente indispensável na vida moderna, como conseqüência disso a quantidade de plásticos descartados tem dramaticamente aumentado. É esperado que com o aumento da população de seres humanos a prevalência de descartes plásticos também aumente, a menos que hábitos cotidianos sustentáveis sejam incorporados, e novos materiais alternativos sejam descobertos e popularizados. Até o momento, diversas pesquisas têm mostrado os efeitos negativos de descartes plásticos sobre a fauna marinha e dulcícola (p. ex.: invertebrados, aves, tartarugas e mamíferos marinhos). Em ambientes aquáticos, plásticos estão em toda parte: na coluna de água, depositados em sedimento fino e dent...

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“…The two methodological approaches combined in this study were chosen according to previous successful applications for inferring continental versus marine influences in the Atlantic Ocean (Romero et al, 1999;Chiessi et al, 2009;Mahiques et al, 2009;Govin et al, 2012;Burone et al, 2013;Perez et al, 2016), as indicated below.…”

Section: Paleoenvironmental Proxiesmentioning

confidence: 99%

“…Ti, Fe and Al are elements related to aluminum/silicates, and are associated with clay minerals carried from the continent as weathering products, and through river discharge, they enter into the ocean (Goldberg and Arrhenius, 1958;Jansen et al, 1998;Yarincik et al, 2000). Therefore these elements vary with the terrigenous portion in offshore sediment (Martins et al, 2007;Burone et al, 2013). Most of the K in marine sediments is also associated with terrigenous materials (Goldberg and Arrhenius, 1958), and it oc-curs mainly in fully arid regions where chemical weathering rates are lower (Govin et al, 2012).…”

Section: Runoff-indicative Element Ratiosmentioning

confidence: 99%

Variability in terrigenous sediment supply offshore of the Río de la Plata (Uruguay) recording the continental climatic history over the past 1200 years

2016

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Abstract. The continental shelf adjacent to the Río de la Plata (RdlP) exhibits extremely complex hydrographic and ecological characteristics which are of great socioeconomic importance. Since the long-term environmental variations related to the atmospheric (wind fields), hydrologic (freshwater plume), and oceanographic (currents and fronts) regimes are little known, the aim of this study is to reconstruct the changes in the terrigenous input into the inner continental shelf during the late Holocene period (associated with the RdlP sediment discharge) and to unravel the climatic forcing mechanisms behind them. To achieve this, we retrieved a 10 m long sediment core from the RdlP mud depocenter at 57 m water depth (GeoB 13813-4). The radiocarbon age control indicated an extremely high sedimentation rate of 0.8 cm per year, encompassing the past 1200 years (AD 750–2000). We used element ratios (Ti  / Ca, Fe / Ca, Ti / Al, Fe / K) as regional proxies for the fluvial input signal and the variations in relative abundance of salinity-indicative diatom groups (freshwater versus marine-brackish) to assess the variability in terrigenous freshwater and sediment discharges. Ti / Ca, Fe / Ca, Ti /  Al, Fe /  K and the freshwater diatom group showed the lowest values between AD 850 and 1300, while the highest values occurred between AD 1300 and 1850. The variations in the sedimentary record can be attributed to the Medieval Climatic Anomaly (MCA) and the Little Ice Age (LIA), both of which had a significant impact on rainfall and wind patterns over the region. During the MCA, a weakening of the South American summer monsoon system (SAMS) and the South Atlantic Convergence Zone (SACZ), could explain the lowest element ratios (indicative of a lower terrigenous input) and a marine-dominated diatom record, both indicative of a reduced RdlP freshwater plume. In contrast, during the LIA, a strengthening of SAMS and SACZ may have led to an expansion of the RdlP river plume to the far north, as indicated by higher element ratios and a marked freshwater diatom signal. Furthermore, a possible multidecadal oscillation probably associated with Atlantic Multidecadal Oscillation (AMO) since AD 1300 reflects the variability in both the SAMS and SACZ systems.

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A multiproxy study between the Río de la Plata and the adjacent South-western Atlantic inner shelf to assess the sediment footprint of river vs. marineinfluence

Cited by 43 publications

References 64 publications

Middle–late Holocene Caribbean aridity inferred from foraminifera and elemental data in sediment cores from two Cuban lagoons

Middle–late Holocene Caribbean aridity inferred from foraminifera and elemental data in sediment cores from two Cuban lagoons

Management and research on plastic debris in Uruguayan Aquatic Systems: update and perspectives

Variability in terrigenous sediment supply offshore of the Río de la Plata (Uruguay) recording the continental climatic history over the past 1200 years

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